Personally, I wouldn't or rather, I don't think I would.
One episode of Botched, and you don't want to risk the downside of body enhancement surgeries.
But then again, to each his own. I believe that every flaw that I have is impeccably beautiful and it's all about accepting oneself and having a healthy self esteem but there could be other reasons why people do stuff.
So, back in the day, I bought a butt pad. Not because I was desperate for bigger bum, but just so my clothes could fit better because I didn't want to slimfit every single thing I buy. But I stopped wearing it shortly after because it just felt awkward - I was always careful that whoever I hugged didnt mistakenly touch my backside, I wouldn't jokingly sit on my friend's lap so I don't get 'why is your bum hard' and have to explain.
See, the story is long. But sha, I think the creams are the worst because you can't take them out or un-use them or whatever.